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Blood, 1 September 2000, Vol. 96, No. 5, pp. 1681-1684
Exaggerated response to endotoxin in mice lacking the Duffy
antigen/receptor for chemokines (DARC)
Tracey C. Dawson,
Alex B. Lentsch,
Zixuan Wang,
John E. Cowhig,
Antal Rot,
Nobuyo Maeda, and
Stephen C. Peiper
From the Department of Pathology, University of North
Carolina, Chapel Hill, NC; Departments of Surgery and Pathology,
J. G. Brown Cancer Center, University of Louisville School of
Medicine, Louisville, KY; and Novartis Forschungsinstitut, Vienna,
Austria.
Duffy antigen/receptor for chemokines (DARC) is a promiscuous
receptor for chemokines that is required for Plasmodium
vivax infection of erythroid cells. This receptor is expressed by
subsets of endothelial, as well as erythroid cells. Selection for
protection from malaria infection resulted in an erythroid-specific
defect, suggesting that DARC may play a critical role in endothelial
biology. Mice with targeted disruption of this gene were generated, and the function of DARC in inflammation was explored. RNA from
spleens of homozygous mutant mice lacked DARC transcripts, which were abundant in wild-type (+/+) and heterozygote (+/ ) mice.
DARC / mice lacked developmental abnormalities and were
healthy at 1 year. Whereas hematologic parameters were within normal
ranges, erythrocytes from nullizygous mice lacked CXC and CC
chemokine-binding activity. Challenge with lipopolysaccharide resulted
in significantly increased inflammatory infiltrates in lung and liver
of nullizygous mice. These results suggest that DARC modulates the
intensity of inflammatory reactions as a sink for chemokines.

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